.sidebar {
    width: 48px;
    height: 100vh;
    background-color: #001529;
    position: fixed;
    left: 0;
    top: 0;
    transition: width 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 10px;
    z-index: 1000;
}

.sidebar.expanded {
    width: 240px;
}

.sidebar-item {
    width: 100%;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.65);
    cursor: pointer;
    transition: all 0.3s;
    padding: 0 16px;
}

.sidebar-item:hover {
    color: #fff;
    background-color: #1890ff;
}

.sidebar-item.active {
    color: #fff;
    background-color: #1890ff;
}

.sidebar-item .anticon {
    font-size: 20px;
}

.sidebar-item .label {
    display: none;
    margin-left: 10px;
    white-space: nowrap;
}

.sidebar.expanded .sidebar-item .label {
    display: inline;
}

.main-content {
    margin-left: 48px;
    transition: margin-left 0.3s ease;
}

.main-content.expanded {
    margin-left: 240px;
}

.attachment-manager {
    background: #fff;
    padding: 24px;
    border-radius: 4px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.upload-section {
    margin-top: 16px;
    padding: 24px;
    border: 1px dashed #d9d9d9;
    border-radius: 4px;
    text-align: center;
}

.upload-section:hover {
    border-color: #1890ff;
} 